<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>

    <style> 
        *{
            margin: 0px;
            padding: 0px;
        }   

        .main {
            width: 520px;
            height: 280px;
            position: relative;
            margin: 100px auto;

        }

        .main a {
            top: 140px;
            position: absolute;
            width: 24px;
            height: 36px;
        }

        .left {
		    left: 0;
		    background: url(../images/left.png) no-repeat;
	    }
	    .right {
		    right: 0;
		    background: url(../images/right.png) no-repeat;
	    }

        .main ul {
            /* width: 70px; */
            height: 13px;
            position: absolute;
            left: 50%;
            bottom: 18px;
            margin-left: -28px;
            background-color: red;
            text-align: center;
        }

        .main ul li {
 		    width: 8px;
 		    height: 8px;
 		    background-color: purple;
 		    float: left;
 		    margin: 3px;
 		    border-radius: 50%;
            list-style: none;
 	}
    </style>
</head>
<body>
    <div class="main">
        <img src="../images/tb.jpg" alt="">
        <a href="" class="left"></a>
        <a href="" class="right"></a>
        <ul>
            <li></li>
            <li></li>
            <li></li>
            <li></li>
        </ul>
    </div>
</body>
</html>